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8. Level 3 Repair
8-4-3. No Service
No service
Home screen → Phone → Keypad
→ *#1234# → check Phone version
→ CP : T285XXXX or unknown
Check the connection of RF coaxial cable
Replace the TCX2000
Yes
CP : J710XXX
Replace the U2002
CP : unknown
END
Check menu setting
Settings → Mobile networks → Network mode → Is setting
auto connect ?
Check the voltage level
C2049 = 1.8V C2050 = 1.2V
C2050 = 1.2V C2052 = 1.2V
C2054 = 1.2V C2057 = 1.2V
C2036 = 1.8V C2059 = 1.8V
Check TCX2000
Frequency = 26MHz
Replace UCP400
No
Yes
No
Yes
Yes
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